Detachable point for earth digging teeth



y 9 I c. c. HOSMER ET AL 2,124,230

DETACHABLE POINT FOR EARTH DIGGING TEETH 7 Original Filed Sept. 17} 19342 Sheets-Sheet l- 67/557251? CEsxvzw ova lam x1" L. Lam 21? July 19,1938. c. c. HOSMER ET AL 2,124,230

DETACHABLE POINT FOR EARTH DIGGING TEETH Original Filed Sept. 17, 1934 2Sheets-Sheet 2 Patented July 19, 1938 UNITED STATES 2.124.230 nn'rscmmrom'r FOR nan'rn mccmo ream Chester 0. Hosmer, Long Beach. and Ernie L.Launder, Montebeiio, Caiih, minors to H. and L. Corporation, HuntingtonPark. Calif., a corporation oi. California Continuation of applicationSerial No. 744,830, September 1'1, 1934. This application March 8, 1937.Serial No. 129,582

14 Claims.

This invention relates to excavating apparatus and relates moreparticularly to the teeth of scarifiers and power operated shovels,ditchers. rooters, etc. A general object of this invention is to providea practical, effective and long wearing replaceable cap or point forteeth of the character referred to.

This application is filed in substitution for and as a continuation ofour application for United States Letters Patent Serial No. 744,330,filed September 17,- 1934, which application was filed in place of ourearlier application, Serial No. 625,640, filed July 29, 1932.

Another object of this invention is to provide a detachable andreplaceable tooth point of the character mentioned that may be easilyand quickly secured to a tooth to be rigid therewith.

Another object of this invention is to provide a point of the charactermentioned that may be no readily removed from the tooth or tooth basefor repair, sharpening, or replacement.

Another object of this invention is to provide a replaceable tooth pointof the character mentioned that is eifectively and tightly secured tothe tooth without the necessity of employing bolts, pins, keys, screwsor other securing elements subject to failure, loosenling or loss.

Another object of this nvention is to provide a tooth point thatembodies deformable or malleable parts adapted to bedistorted or bent tocooperatively fit the tooth base to dependably and securely attach thepoint to the tooth or tooth base.

Another object of this invention is to provide a detachable point of thecharacter mentioned having extensive bearing surfaces for cooperatingwith complementary surfaces of the tooth to resist or prevent working ofthe point relative to the tooth.

40 Another object of this invention is to provide a detachable toothpoint of the character mentioned that has parts-cooperating with thetooth base forming retaining means for retaining the point on the baseand located to minimize racking or straining of the retaining means ifthe point works relative to the tooth base.

Another object of this invention is to provide a detachable tooth pointhaving a hardened wear resisting digging or working portion and a softermounting portion joined therewith and having characteristics thatfacilitate its being efiectively and securely joined with the toothbase.

Another object of this invention is to provide a detachable tooth pointcomprising a body of hard wearresisting material for acting on the earthor material handled and a malleable housing on the hard body for fittingover a part of the digger tooth and capableof being distorted orindented to form it with parts cooperating with the tooth to secure thepoint to the tooth.

Another object of this invention is to provide a ,replaceable toothpoint of the character mentioned in which the hard body constitutes aspike projecting forwardly from the housing in a manner to penetrate theearth without interference by the housing and to protect the softermalleable housing against injury and wear.

Another object of this invention is to provide a tooth point including ahard spike forming body, a malleable housing on the body deformable toconnect with a tooth base. and a tang for engaging the tooth base totake strains that might otherwise distort or over-strain the housing.

A further object of this invention is to provide detailed description ofa typical preferred form and application of the invention, throughoutwhich description reference is made to the accompanying drawings, inwhich:

Fig. 1 is a top or plan view of an improved replaceable point of theinvention in position on a tooth or tooth base. Fig. 2 is a verticaldetailed sectional view taken substantially as indicated by line 2-2 onFig. 1. Fig. 3 is a transverse, detailed sectional view taken asindicated by line 3-3 on Fig. 1. Fig. 4 is a fragmentary perspectiveview of the inner end of the tooth point. Fig. 5 is a fragmentaryperspective view of the outer portion ofthe tooth base with its outerpart broken away. Fig. 6 is a perspective view of a wedge that may beutilized in removing the point from the tooth base. Fig. 7 is a reducedplan view or elevation of a device that may be employed for indentingthe malleable box when the point is being applied to the tooth base.Fig. 8 is a view similar to Fig. 2 of another form of the Jillinvention. Fig. 9 is a view similar to Fig. of the form of the inventionshown in Fig. 8, and Fig. is a view similar to Fig. 4 illustrating aportion of the device shown in Fig. 8.

The replaceable tooth caps or points of the present invention may beconstructed for use on teeth of various types and forms. In thefollowing detailed description we will describe the invention asemployed on a more or less conventional type of tooth which is suitablymodified to receive the cap or point of the invention. It is to beunderstood that the invention is not to be construed as limited orrestricted to the specific form or application about to be described,but that it is to be taken as including any features or modificationsthat may fall within the scope of the claims.

We will first describe the structure illustrated in Figs. 1 to 5 of thedrawings.

The portion of the tooth base illustrated in the drawings may beconsidered as a part of a tooth such as may be used on dippers of powershovels, trenching machines, etc. The tooth illustrated includes what wewill term a shank or base 10 which is substantially rectangular intransverse cross section. The base Ill has fiat parallel sides I I andfiat upper and lower surfaces l2 and I3, respectively. In accordancewith the usual practice the upper and lower surfaces l2 and I3 of thetooth base I 0 converge forwardly or outwardly toward the outer end ofthe tooth. The shank I0 is provided with a reduced part l4 projectingforward from its outer end or face l5. The outer face l5 of the base I0is substantially normal to its sides H and the reduced part l4 projectsforwardly from the face l5 as an integral continuation of the toothbase.

The tooth part H where it joins the base in is of less vertical andhorizontal extent than the face l5 of the base It! and is located sothat its sides are spaced inwardly from the sides H of the base and itstop and bottom surfaces are spaced inwardly from the upper and lowersurfaces 12 and I3 of the base. The sides l6 of the part ll aresubstantially parallel while the top H and bottom l8 converge outwardlytoward the outer end of the tooth making the part I wedge shaped. Thetop H of the tooth part l4 lies in a plane parallel with the uppersurface l2 of the base In while the bottom surface l8 slopes upwardlyand outwardly relative to the top II to join the top at the slightlyrounded outer end of the part l4. Indentations or recesses I!) areprovided opposite each other in the sides [6 of the tooth part 14. Therecesses l9 are located about midway between the upper and lower edgesof the sides l6 and terminate a short distance forward of the face I5from which the part l4 projects. The walls of the recesses l9 preferablytaper or converge inwardly as best illustrated in Figs. 3 and 5 of thedrawings.

A socket or opening extends rearwardly into the base in from its outerface IS. The opening 20 is polygonal or rectangular and extends into thebase ID from adjacent the top I! of the part l4. The lower wall of theopening 20 forms an unbroken continuation of the top I! of the toothpart M. A downwardly and outwardly inclined opening 2| extends from theupper surface l2 of the base it) to the inner end of the opening 20. Theopening 20 is of less widthor transverse extent than the'part l4 and theopening 2| may be of less width than the opening 20. In the form oftooth base shown on Sheet 1 of the drawings bevelled or rounded surfaces22 join or connect the upper surface l2 and the forward face l5 of thebase Ill. The surfaces 22 are spaced apart and are out of verticalalignment with the opening 20. They are preferably located at oppositesides or beyond the ends of the opening 20.

The improved cap or point of the present invention includes, generally,a body 25 forming a spike and a housing 26 on the body for mounting iton the tooth base.

The body 25 constitutes the active earth engaging element of the point.The body 25 is a plate-like member and may have flat parallel upper andlower surfaces 21 and 28. In the particular form of the inventionillustrated the body 25 is rectangular in plan elevation havingstraight, parallel inner and outer ends 29 and 30, and parallel edges29. The point body 25 is elongate and has its longitudinal axis parallelwith the longitudinal axis of the tooth base Ill. It is to be understoodthat the body 25 may have a shape or configuration different than that ilustrated. The outer or forward portion of the body 25 has its lowersurface 28 bevelled to be in convergent relation to the upper surface 21whereby the outer portion of the body 25 constitutes what we will term aspike 3| for digging into or penetrating the earth. The outer or forwardedge 30 of the body 25 is preferably bevelled or sharpened, asillustrated.

When the point or device is in position on the tooth base H! the lowersurface 28 of the body 25 bears fiatly against the top I! of the toothpart l4 and the spike 3i projects or extends forwardly beyond the partI4. In accordance with the invention the body 25 is formed of a hardmaterial to resist the abrasion and wear to which it is subjected whenthe tooth is in service. The invention contemplates the formation of thebody 25 of any suitable hard, wear resisting material. In practice, thepoint body may be formed of a type of steel subject to being heattreated to obtain a high degree of hardness and the necessary degree oftoughness to stand the abrasion and shock occurring during operation. Inpractice we employe a high carbon alloy steel, such as chrome vanadiumor chrome molybdenum steel.

In accordance with the invention as shown in Figs. 1 to 5, the body 25has a tongue or tang 32 projecting from its inner end 29. In thepreferred construction the tang 32 is integral with the body 25. Thetang 32 is proportioned to fit into the above described socket oropening 20 and is of less thickness than the body 25 and of less widththan the body. The lower side of the tang 32 forms an unbrokencontinuation of the lower surface 28 of the body 25 to bear against thelower wall of the opening 20 when the lower surface 28 of the body is inbearing engagement with the top H of the part II. In practice the tang32 fits the opening 20 closely to have its edges or sides as well as itsupper and lower surfaces in cooperation with the walls of the opening20. The tang 32 cooperating with the opening 20 materially assists intransmitting the active or operating forces between the body 25 and thetooth base H, as will be more fully described. The body 25 may havebevelled or rounded surfaces 33 connecting or joining its upper surface21 and its inner end 29. The rounded surfaces 33 are spaced at oppositesides of the tang 32 -to be opposite the rounded surfaces 22 of the baseIn when the point is in position on the base.

The housing 26 is provided to embrace or engage the tooth part I and hasmalleable parts adapted to be indented into the recesses I! to removablysecure the point to the tooth base II. The housing 26 is formed on orsecured to the under side of the body 25 and is shaped and proportionedto rather closely or snugly receive the tooth part l4. In accordancewith the invention the housing 26 is substantially channel-shaped orU-shaped in transverse cross section having spaced side walls 34 and abottom wall 35 extending between and connecting the walls 34. The sidewalls 34 are preferably fiat and parallel and lie against oradjacent-the sides l6 of the tooth part l4 when the point is'in positionon the tooth base. The bottom wall 35 of the box 26 is fiat and inclinedupwardly and outwardly toward the forward end or spike 3| of the body 25to lie against or adjacent the bottom l8 of the tooth part l4. The sidewalls 34 are triangular in side elevation having their upper endsinclined downwardly and forwardly to conform to and engage against thelower surface 28 of the body 25. The forward end of the bottom wall 35is likewise adapted to engage against the lower surface 28 of the body25. The inner or rear end of the housing 26 is open to receive the toothpart l4 so that the point may be readily slid over the part |4.

The housing 26 is rigidly secured to the point body 25 so that the twoelements form a unit. In practice the housing 26 is integrally connectedwith the body 25 by welding 36 which joins the upper edges of the sidewalls 34 to the lower side of the body 25. The forward end of the bottomwall 35 is welded to the lower side of the body 25 at 31. With the body25 and the housing 26 connected or assembled as just described the body255cl5ses the upper side of the housing 26. When the detachable point isin place on the tooth part l4 the lower wall 35 engages the bottom l8 ofthe part l4 and the lower surface 28 of the body 25 engages the top Hand the lower surface of the tang 32 has extensive bearing on the partl4 and these parts are related so that the rear end 29 of the body 25 isspaced a short distance from the face l5 of the tooth base. With thisrelationship of the parts the rounded surfaces 22 and 33 are spacedapart. The housing 26 is formed to closely or snugly receive the toothpart l4 so that its inner surfaces and the lower surface 28 of the body25 have extensive bearing engagement with the surfaces of the part l4.

It is a feature of the invention that the sides of the housing 26 aredeformable or malleable. The housing 26 is formed of malleable steel, orthe like, as hereinafter described, and its side walls 34 are somewhatthinner than the point body 25 so that they can be distorted in thedesired manner. The housing 26 is formed so that its side walls 34 maybe indented or pressed inwardly to have inwardly projecting parts 38occupying or cooperating with the recesses l9 in the sides l6 of thetooth part l4. The parts 38 are opposite each other in coincidentrelation with a trans-- verse axis which is at right angles with theion-- gitudinal axis of the tooth. The parts 38 cooperate with therecesses l9 to dependably secure the detachable point to the tooth basel0. As initially formed for arrangement on the part l4 the side walls 34are flat and parallel so they can be easily slid over the part N. Ifdesired, relatively small depressions 39 may be provided in the outersurfaces of the side walls 34 to indicate the points at which the sidewalls are to be indented.

In accordance with our invention. the tooth point provided has ahardened tough body and a housing 26 on or joined with the body to havemalleable side walls that can be indented to extend into the recessesl9. The body and housing are preferably welded together and the bodyheat treated, the housing 26 being formed of steel that will not take ahardness through heat treating which hardens the body 25, or which canbe annealed after the body has been hardened. We prefer to form the boxor housing 25 of a soft or mild steel that will not take hardness.

To apply the point to the tooth base I the housing 26 and body 25 arefirst slid over the tooth part II, that is, they are moved inwardlyrelative to the tooth base l8 so that the part I4 is received in thehousing 26. At the same time that the point I4 is being received in thehousing 26- the tang 32 is entered in the opening 28. The detachablepoint may be moved inwardly on the part l4 until the top and bottomsurfaces l1 and I8 of the wedge-shaped part l4 cooperate with the undersurface 28 of the body 25 and the inner surface of the bottom wall 35 tostop further movement. The point is then in position to be secured tothe tooth base l0. To secure the detachable point to the tooth base IDthe side walls 34 of the housing 26 are indented to have the parts 38fit into or cooperate with the recesses l9. It is to be understood thatthe side walls 34 of the housing may be indented or depressed in anysuitable or convenient manner.

In Fig. 7 of the drawings we have illustrated a tool that may beconveniently employed to distort the side walls 34 to form the parts 38.This tool comprises a rectangular frame-like body 48 and screws 4|threaded through openings 42 in the ends of the tool body 48. The toolbody 48 is adapted to be passed over the outer end of the detachablepoint to a position where the inner ends of its screws 4| are oppositethe depressions 39. The inner ends of the screws 4| may carry hardenedballs 43 for cooperating with the side walls 34 of the housing 36. Thedepressions 39 may serve to center or locate the screws 4|. When thescrews 4| are threaded inwardly they operate to indent or press inwardlythe side walls at the desired points to form the parts 38 which extendinto or cooperate with the recesses l9. These inwardly bent parts 38 arein the nature of projections or raised portions on the inner surfaces ofthe walls 34 which engage the walls of the recesses l9 to firmly andsecurely attach the point to the part l4 of the tooth base III.

In operation the excavating tooth may be employed in the manner usual tosuch devices. The spike portion or spike 3| of the body 25 projectsforwardly from the housing 26 to have a very effective angle ofpenetration. It is to be noted that the outer end of the spike or bodyis below the lowermost plane of the housing 26 sq that it may penetratethe earth without interference by the housing and so that it protectsthe housing 26 against wear and injury. The body 25 being formed of hardwear resisting-material is long wearing and the point has a long life.In the case of downward load coming on the tooth the lower surface 28 ofthe body 25cooperates with the top ll of the part l4 and the lower wallof the opening 20 so that there is a direct transmission of operatingloads and stresses to the part l4 of the tooth base Hi. When the toothis operated so that pressure occurs on the outer proinner end of thebody 25 at either side of the tang 32 bears against the face I5 of thebase after which inward pressures are transmitted directly from tlmpointbody to the base. It will be apparentthat if such slight movement orWorking occurs between the tooth point and the part l4 such movement orworking does not interfere with or tend to disturb the connection whichretains the point on the part l4. When in operation upward force occurson the projecting outer end portion of the point body 25 and such forcetends to lift the body upwardly off of the part l4, the tang 32 acts asa retaining means at the rear or inner end of the point body so thatthere is a tendency for the body to rock or turn about an axis in thevicinity of the point where the tang 32 joins the tooth body. Suchtendency for the tooth or point body to turn is resisted by the housingembracing the part I4. The forward end of the part l4 fits into thehousing close to the point where the housing is welded across its entirelength to the body part- 25 so that the housing cooperates with the endportion of the part l4 to effectively resist the tendency for the pointbody to turn or rock upwardly. The tang 32 being engaged in the socketis eifective in preventing lateral working or shifting of the rearportion of the tooth point relative to the part I4 such as mightotherwise tend to distort the malleable housing, causing the retainingmeans to work loose. It is to be observed that the transverse axis onwhich the indentations 38 are formed is so located that any clearancedeveloping between the tooth point and the part I4, allowing the toothpoint to work up and down at its outer end, has little or no tendency toforce the indentations 38 out of cooperative engagement with the recessIS in the part l4 and therefore, the indentations serve to effectivelyretain the point on the part 14 under severe working conditions.

In the form of the invention illustrated in Figs. 8. 9 and 10 thevarious elements l0, I4, 26, 36 and 3t and their parts correspondgenerally with the corresponding elements l0, I4, 26, 36, and 3i, shownin Figs. 1 to 5, inclusive, except only that the tang 32 has beeneliminated from the] rear end of the point body In this case it is, ofcourse, unnecessary to form the base ID with an opening or socket toreceive a tang. Further, in this modified form of the invention we haveshown the parts without the rounded corners 22 and 33 hereinabovedescribed, as this form of the invention is generally adapted forlighter use and smaller and lighter embodiments of the invention, inwhich casespecial projections may not be necessary to facilitateremoving of the point for repairing or replacement. Further, in usingsmaller or lighter embodiments of the invention it may not be necessaryto use special tools to form the retaining indentations 38 in the sidewalls of the point housing, it being possible to hammer suchindentations in the housing with any tool ordinarily available.

When it becomes necessary or desirable to remove the point from thetooth base 10 the point is forced outwardly so that the indented parts38 are pressed or forced outwardly from the recesses l9. In practice thedetachable point may be forced from the tooth base In in any convenientor practical manner. In Fig. 6 of the drawings we have illustrated awedge 45 that may be employed to remove the point from the tooth baseIll. The wedge 45 has two depending wedge legs 46 and these legs 46 areadapted to be inserted between the pairs of opposing surfaces 22 and 23.The wedge 45 may then be driven inwardly so that its legs 46 wedgebetween the surfaces 22 and 33. The broken lines of Fig. 2 illustratethe wedge 45 in position to force or drive the point from the tooth base[0. The legs 46 cooperating with the rounded surfaces 22 and 33 areeffective in forcing the point outwardlyfrom the tooth base iii. Ifdesired, a punch may be inserted through the opening 2| and drivenagainst the inner end'of the tank 32 to drive or assist in driving thepoint from the tooth base. When the point is driven from the tooth baseIII the tapered or inclined walls of the recesses l9 serve to bend orforce the parts 38 outwardly so that the side walls 34 are substantiallystraightened or returned to their original condition. This permits thepoint to be reapplied to the tooth base l0 after sharpening.

The present invention provides a detachable and replaceable point forthe teeth of excavating g apparatus that is very inexpensive and that islong wearing. The point is formed so that it may be easily and quicklysecured to a tooth base in such a manner that it cannot work loose orbecome detached when the tooth is in operation. The point is securelyattached to the tooth base without the employment of bolts, keys, pinsor the like, that are liable to become loose or displaced. The point isformed to have extensive bearing engagement with the surfaces of thetooth base so that the heavy stresses are directly transmitted to thebase.

Having described only typical preferred forms and applications of ourinvention, we do not wish to be limited or restricted to the specificdetails herein set forth, but wish to reserve to ourselves anyvariations or modifications that may appear to those skilled in the artor fall Within the scope of the following claims.

Having described our invention, we claim:

1. The combination with an earth digging tooth base having a lugprojecting from its forward end and provided in its forward portionabove said lug with an opening that is closed on both sides, top andbottom, the base having the end portions of its upper forward cornerbevelled or rounded, of a tooth point including, a body, a housing onthe body that receives said projecting lug, and a tang projectingrearwardly from the body for engagement in the said opening, the housinghaving the end portions of its upper rear corners bevelled or rounded.

2. In combination, an earth digging tooth base having a lug projectingfrom its forward end, there being a recess formed in the forward portionof said tooth base above said lug and the sides of said lug beingrecessed, and a tooth point including, a box-shaped rear portion for thereception of the lug on the tooth base, and a tang projecting from theupper rear portion of said point for engagement in the recess in saidtooth base, the box-shaped rear portion of said point having side wallspressed into the recesses in the sides of said lug for securing thedetachable point to said tooth base, the said side walls being pressedinto the recesses on an axis transverse of the tooth point and of thedirection of the major forces tending to move the point on the base whenthe structure is in use.

3. A detachable point for an earth digging tooth comprising, a body ofhard wear resisting material, a housing of softer material on the rearportion of the body and including side walls integrally secured to theunder side of the body, and a bottom wall whose forward end is remotefrom 30 a forces tending to move the point on the base the front edge.of the body to leave a clearance space on the under side of the forwardportion of the body, and a tang projecting rearwardly from the rearendof the body.

4. A detachable point for an earth diggingtooth comprising, a body ofhard wear resisting material, a housing of softer material on the rearportionlof the body and including side walls integrally secured to theunder side of the body, and a bottom wall whose forward end is remotefrom the front .edge of the body to leave a clearance space onthe underside of the forward portion of the body, and a tang projectingrearwardly from the rear end of the body, the upper rear corner of thebody having rounded or bevhaving a lug projecting from its forward end,

there being recesses in the sides of the lug and an opening in the upperportion of the tooth base at the rear. of said lug, and a detachablepoint comprising, a body adapted to overlie the top of said lug, ahousing secured to the under side of the rear portion of the bodyforming a cap to receive the lug, and a tang projecting from the rearportion of the body to cooperate with said opening, the housingincluding side walls adapted to be pressed into said recesses to securethe point to the tooth base, on an axis transverse of the tooth pointand of the direction of the major when the structure is used.

6. A tooth point adapted to be applied to a tooth base having oppositeindentations in its sides including, a separately formed hard wearresisting spike adapted to overlie and bear downwardly on the base andproject forwardly beyond the base, and a malleable housing integral- 1yjoined with the spike forming therewith a structure to embrace the base,the housing including parts adapted to overlie said indented sides ofthe base and to be distorted into their indentations to connect thepoint and base on an axis transverse of the tooth point and of thedirection of the major forces tending to move the point on the base whenthe structure is used.

7. A tooth point to be applied to a tooth base having recessed sides anda forwardly opening socket including, a hard wear resistant spikeadapted to overlie the base and project forwardly beyond the base, atang on the spike to extend into the socket, and a housing withmalleable sides integrally joined with the spike and forming therewith astructure embracing the base, the housing including parts adapted tooverlie said sides of the base and to be distorted into their recessesto connect the point and base on an axis transverse of the tooth pointand of the direction of the major forces tending to move the point onthe base when the structure is used.

8. A tooth point adapted to be applied to a tooth base having indentedsides including, a hard wear resisting spike adapted to overlie the baseand project forwardly beyond the base, and a malleable housingintegrally joined with the spike forming therewith a structuresurrounding the base, the housing including parts adapted to overliesaid indented sides of the base and to be distorted into theirindentations to connect the point and base on an axis transverse of thetooth point and of the direction of the major forces tending to move thepoint on the base when the structure is used, the housing being spacedrearwardly from the forward projecting end portion of the spike.

f 9. A tooth point adapted to be applied to the forward part of a toothbase, the sides of said part being recessed including. a wear resistingbody adapted to overlie said part of the base to bear against its uppersurface and to project forwardly beyond said part, nd a malleablehousing secured to the under si e of the body to embracesaid part, thehousing including portions adapted to .be distorted into therecessed-sides of the said parts to secure the point to the base, thebody having bearing engagement with said upper surface rearward of thecommon transverse axis of the distorted portions to prevent working ofthe point about said axis.

10. A tooth point adapted to be applied to the forward part of a toothbase, the sides of said part being recessed including, a wear resistingbody adapted to overlie said part of the base to bear against its uppersurface and to project forwardly beyond said part, and a malleablehousing secured to the under side of the body to embrace said part, thehousing including side walls adapted to be distorted into the recessedsides of the base part to secure the point to the base, the body havingbearing engagement with the upper surface of the base part forwardly andrearwardly of the transverse axis of the connection fo med by thedistorted side walls.

11. A tooth point adapted to be applied to the forward part of a toothbase, the sides of said part being recessed including, a wear resistingbody adapted to overlie said part of the base to bear against its uppersurface and to project forwardly beyond said part, and a malleablehousing secured to the under side of the body to embrace said part, thehousing including portions adapted to be distorted into the recessedsides of the said part to secure the point to the base, the body andbase having cooperating parts spaced rearwardly of the distortedportions to prevent lateral working of the point on the base.

12. A tooth point adapted to be applied to a tooth base having a forwardend face, recesses in its sides and a forwardly opening socket in saidend face, the point including a spike body adapted to overlie the baseto bear on its upper surface and to project forwardly beyond the base, ama]- leable housing secured to the under side of the body and adapted toreceive the forward part of the base, the housing including sidesadapted to be forced into said recesses to attach the point to the base,the spike body and the housing having their rear ends in a common planeand in opposing and parallel relation to the forward end face of thebase, and a tang projecting from the rear end of the spike body andcooperating with said outer face and spaced below the upper side of thetooth, and a point for the tooth comprising a spike body for hearingagainst the upper side of the lug, and a housing of material softer thanthe spike body integrally secured to the under side of the spike bodyand including a lower wall for engaging the under side of the lug andside walls indented to grip the opposite sides'of the lug on an axistransverse of the point and of the direction of the major forces tendingto move the point on the lug when the structure isoperating, the innerend of the spike body opposing and being zubtsltantially parallel withsaid outer face of the 14. In combination, a digging tooth having asubstantially flat outer face and a lug protruding forwardly from saidouter face and spaced below the upper side of the tooth, the oppositesides 0! the lug being indented, and a point tor the tooth comprising ahard wear resistant spike body engaged on the upper side or the lug withits inner end opposing the outer face of the tooth, and a box integrallysecured to the spike body and embracing the lug, the box includingmalleable side walls having straight continuous edges bearing againstsaid face, the walls being indented to substantially conform to thesides of the lug to detachably secure the point to the tooth on an axistransverse of the point and of the direction of the major forces tendingto move the point on the lug when the structure is operating.

CHESTER C. HOSMER.

ERNIE L. LAUNDER.

